Engineering Calculators & Converter Applets & Spreadsheets

These calculators are offered free of charge
- some by vendors and others by individuals. Some are stand-alone and others function
online via Java from the web page. The majority are engineering calculators, but
some are scientific calculators, some are amateur radio calculators, and some are
electrician type calculators.

A good way to find on this page what you need is do
a browser page search.

If you cannot find what
you are looking for here, try the Software page.

AccelWareUnit Conversion
Tool - powerful, intuitive, and easy-to-use utility for quick and accurate conversion
between almost every possible unit of measure, from one system to another. The latest
version includes more than 2200 units in 78 categories. The categories include:
length, area, speed, mass, numbers, volume, time, density, force, pressure, energy,
power, flow, temperature, angle, light, fractions, data transfer, and many more.
Fully functional Online version now available.

All About Circuits
This is a nice assortment (83 at this time) of electrical &
electronics parameter calculators, with a couple mechanical types as well. There
are many types of substrate impedance and line dimension calculators, and calculators
for voltage dividers, inductance and capacitance, coax lines and waveguides, amplifiers,
impedance matching, free space loss, EIRP, radar range, and noise figure.

AlphiMAX P2P Signal Propagation
CalculatorA very nice graphical interface tools that enables you
to compare manufacturers, while taking into account the terrain of your area, terrain
type, climate, antenna type, define fade margin and more. Use of a GPS database
produces a very accurate elevation profile between antenna locations.

Connect802 Antenna
System DesignerAn on-line calculator that creates a wireless network
antenna system design report based on various parameters that you provide. It will
help you predict end-to-end performance and evaluate your network design when you
plan a point-to-point, or point-to-multipoint outdoor wireless network deployment.
You'll be able to analyze the radio link and tune network parameters for optimal
link suitability.

eeWeb
Advanced features including support for complex numbers, unit conversion, base conversion,
and has a built in equation solver. eCalc is one of the best calculators on the
web and runs completely in your browser without requiring any special plugins. Electrical
engineers will find eCalc's complex math especially useful since it supports both
rectangular and polar formats. eCalc supports both RPN and Algebraic Input Modes.

Excalibur RPN Calculator AppletExcalibur does not
use more conventional "algebraic" notation like many low-end calculators on the
market. Instead it uses the high-powered parenthesis-free RPN notation (Reverse
Polish Notation).

Fast Fourier Transform CalculatorDo an FFT by entering
the time domain data in the Time Domain Data box with each sample on a new line.
For complex (I and Q) data, the real and imaginary components should be on the same
line separated by a comma. Do an Inverse FFT by entering the frequency domain data
in the Frequency Domain Data box with each sample on a new line. For complex (I
and Q) data, the real and imaginary components should be on the same line separated
by a comma.

Field Strength CalculatorEnter frequency and antenna
gain, then any one of received power, electric field strength, magnetic field strength,
or power density and this calculates the others.

Fresnel Zone CalculatorThe calculator will generate
the radius of the first Fresnel zone only (at the obstacle point or the mid-point),
the 60% (no obstacle) radius and the height of the earth curvature at the mid-point
of the Total link distance. By Wireless Connections.

HiDigit
Scientific calculator with extended capabilities. Advantages include a simple input
format even for the most complicated scientific formulas; i.e., enter "10pi" instead
of "10*pi" or complex numbers as "1+2i".

Resistor Ratio Calculator
Leslie Green / U.K.A resistive network calculator for problems using two or
three fixed resistors. You have to use standard values, but you need some silly
ratio like 3.245 V from a 10 V source. This program helps you to pick the optimum
resistor values for simple resistor dividers or opamps (inverting and non-inverting).
Freeware.

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas
and reference material while performing my work as an RF system and circuit design engineer.
The Internet was still largely an unknown entity at the time and not much was available
in the form of WYSIWYG
...

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used on the RF Cafe website are hereby acknowledged.